*{
    padding: 0;
    margin: 0;
}
.tab-bar{
    background-color: whitesmoke;
}
.tabber{
    background-color: whitesmoke;
}
@media all and (min-width:500px){
    #app{
        /* background-color: aqua; */
        width:500px;
        /* 居中显示 */
        margin: 0 auto;
    }
    
    /* 设置大屏上内容的高度 */
    .box{
        height: 100rem;
    }
    /* 设置大屏底部导航栏的适应效果 */
    .tab-bar{
        position: sticky;
        bottom: 0;
        background-color: whitesmoke;
    }
}